JP4872719B2 - Mold apparatus for casting and casting method - Google Patents

Description

  The present invention relates to a casting mold apparatus and a casting method, and more specifically, in a casting mold in which a pair of left and right heat retaining members are disposed in a space between the hot metal parts between a pair of movable molds. The present invention relates to a casting mold apparatus and a casting method that reduce the dropping of residue on the upper surface of the gypsum mold when tightening and further improve the service life of the heat retaining member.

  Conventionally, a fixed mold in which a plaster mold is installed on a base frame of a casting mold apparatus, and a pair of left and right movable molds that can be opened and closed on the fixed mold through a mold opening and closing device. There is known a gypsum casting mold in which a hot metal part is provided on a cavity of a product part that is installed and partitioned by the gypsum mold and the movable mold, and the molten metal filled is more than the cavity of the product part. 2. Description of the Related Art A casting mold is known in which a pair of left and right heat retaining members are disposed in a hot-water supply space so that the hot-water supply is slow.

  By the way, in the casting mold in which the pair of left and right heat retaining members are arranged in the feeder space as described above, the cast product part surface (profile surface) is missing, or a part of the surface becomes concave, There has been a problem that a product defect of a cast product occurs or a product correction work is caused later (see, for example, Patent Document 1).

As a cause of this, for example, when the mold is clamped, a pair of heat insulating materials may hit the movable mold before the movable mold due to expansion and thermal distortion of the mold. It will fall to the surface. In this state, it has been found that if the molten metal is filled in the cavity of the product part, a defect in the thickness of the gypsum surface of the casting occurs.
JP-A-7-290227

  The present invention pays attention to such a conventional problem, and in a casting mold in which a pair of left and right heat retaining members are disposed in a feeder space between movable dies, the upper surface of the gypsum mold is clamped when the heat retaining member is clamped. An object of the present invention is to provide a casting mold apparatus and a casting method capable of reducing problems caused by dropping and further improving the life resistance of the heat retaining member.

  In order to achieve the above object, according to the present invention, a casting mold apparatus according to the present invention is provided with a heat retaining member provided with a pair of left and right slidable opening and closing drive devices in a feeder space between a pair of movable molds. The gist of the present invention is to provide a control means for closing the pair of left and right heat retaining members when the amount of the molten metal in the cavity of the product portion exceeds a certain amount.

  Here, the pair of left and right heat retaining members are formed in a U-shaped plane cross section using ceramic fiber or graphite as a raw material, and the control means detects the amount of molten metal in the cavity by the detecting means, and opens and closes the heat retaining member. The device is controlled, the amount of molten metal supplied into the cavity is detected to control the opening / closing drive device of the heat retaining member, and the hot water supply time of the molten metal into the cavity is further detected to open / close the heat retaining member. The drive device is controlled.

  Further, the casting method of the present invention opens the heat retaining member provided with a pair of left and right opening / closing drive devices disposed in the feeder space between the pair of movable molds, and allows the gypsum mold and the movable mold to be opened. When filling molten metal into the cavity of the partitioned product section, when the amount of molten metal in the cavity reaches a predetermined position below the heat retaining member from the upper surface of the gypsum mold, the pair of left and right heat retaining members is opened and closed via the control means. The gist is to drive and close the driving device.

  Here, when the amount of the molten metal in the cavity reaches a predetermined position by the contact or non-contact type molten metal level gauge disposed in the cavity of the mold, the pair of left and right heat retaining members are driven to open and close via the control means. The device is driven and closed, and the open / close drive device of the pair of left and right heat retaining members is driven and closed via the control means while measuring the filling amount of the molten metal filling device for filling the molten metal into the mold cavity. .

  Further, the means for measuring the filling amount of the molten metal filler uses an angle meter provided in the molten metal filler or a timer for setting a tilt time of the molten metal filler.

  In this manner, a heat retaining member having a pair of left and right slidable opening / closing drive devices is disposed in the hot water space between the pair of movable molds, and the heat retaining material is maintained when the amount of molten metal in the cavity reaches a predetermined position. By clamping the member, it is possible to reduce problems caused by debris dropping on the upper surface of the gypsum mold when the heat retaining member is clamped and to further improve the service life of the heat retaining member.

  In the present invention, as described above, the heat retaining member provided with the slidable opening / closing drive device is disposed in the hot water space between the movable molds, and when the amount of the molten metal in the cavity reaches a predetermined position, the heat retaining member As the mold is clamped, it is possible to effectively prevent the casting product part surface (profile surface) from missing or part of the surface from becoming concave, resulting in casting product defects. The work can be reduced, and the life of the heat retaining member can be improved.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a longitudinal sectional view of a casting mold apparatus embodying the present invention. This casting mold apparatus is fixed by installing a gypsum mold 2 on a base frame 1 having a concave cross section of the casting mold. On the fixed mold 3, a pair of left and right movable molds 5a and 5b which can be opened and closed via a pair of left and right mold opening / closing devices 4A and 4B are installed.

  On both sides of the fixed mold 3 and the movable molds 5a and 5b, mold opening / closing plates 7a and 7b are installed, which are slidable on guide rails 6 laid on the base frame 1, and the mold opening / closing plates. 7 a and 7 b are configured to open and close via opening and closing cylinders 8 a and 8 b attached to the side surface of the base frame 1.

  On the cavity 9 of the product part Q divided by the plaster mold 2 and the movable molds 5a and 5b, a feeder part space part 10 of the feeder part is provided, and between the pair of movable molds 5a and 5b. A pair of left and right slidable heat retaining members 12 a and 12 b provided with an opening and closing drive device 11 such as a hydraulic cylinder or a drive motor are arranged in the feeder space portion 10.

  The pair of left and right heat retaining members 12a and 12b are formed in a U-shaped flat cross section using ceramic fiber or graphite as a raw material, and the contact surfaces 12x of the heat retaining members 12a and 12b are arranged so that the concave surfaces face each other. ing.

  In addition, an operating rod 11a of an opening / closing drive device 11 such as a hydraulic cylinder or a drive motor installed on the side surfaces of the mold opening / closing plates 7a, 7b is connected to the back surfaces of the heat retaining members 12a, 12b. Connected to the pair of left and right heat retaining members 12a and 12b is a control means for driving the opening / closing drive device 11 to close when the amount of the molten metal W in the cavity 9 of the product portion Q exceeds a predetermined amount.

  As the control means, the amount of molten metal in the cavity is detected by a detecting means 13 such as a contact or non-contact type molten metal level gauge, and the heat retaining members 12a and 12b are driven to open and close via the control device 14 based on the detected value. The apparatus 11 is controlled.

  Further, a melt filler 15 (generally called a ladle) for supplying a molten metal W such as aluminum is installed on the feeder space 10 between the movable molds 5a and 5b. 15 is configured to be able to turn around a rotation center axis including an angle meter 16 and a timer T. The angle meter 16 or the timer T is configured to drive the opening / closing drive device 11 via the control device 16 as another embodiment.

  Next, a casting method using the above casting mold apparatus will be described with reference to FIGS. 2 (a) and 2 (b) to FIGS. 5 (a) and 5 (b).

  2A and 2B are a plan view and a cross-sectional view taken along the line AA of the casting mold before filling the molten metal, and a stationary mold 3 and a movable mold 5a and 5b in which the gypsum mold 2 is installed. And the pair of left and right heat retaining members 12a and 12b are in an open state.

  From such a state, as shown in FIGS. 3A and 3B and FIGS. 4A and 4B, the cavity of the product portion Q partitioned by the plaster mold 2 and the movable molds 5a and 5b. 9 is sequentially filled with molten metal W such as aluminum by a melt filler 15. When the level of the molten metal W (the amount of molten metal) reaches a predetermined position below the heat retaining members 12a and 12b from the upper surface of the gypsum mold 2, in the first embodiment of the present invention, contact or non-contact as control means It is detected by a detecting means 13 such as a molten metal level gauge, and based on the detected value, the opening and closing drive device 11 of the heat retaining members 12a and 12b is driven and controlled via the control device 14 to clamp the heat retaining members 12a and 12b ( (Closed).

  As described above, when the water level (the amount of the molten metal) of the molten metal W reaches a predetermined position, the heat retaining members 12a and 12b are pre-clamped (closed), so even if some of the heat retaining members 12a and 12b are lost. The chipping piece does not fall on the upper surface of the gypsum mold 2 and effectively prevents the casting product surface (profile surface) from being missing or a part of the surface becoming concave, resulting in a casting product defect. It can be done.

  In this way, until the predetermined amount of molten metal W is filled, the fixed mold 3 and the movable molds 5a and 5b are clamped as shown in FIGS. 5 (a) and 5 (b). The heat retaining members 12a and 12b are also clamped (closed). The filling time of the molten metal W depends on the size of the cast product, but one filling of the tire mold is completed in about 2 to 4 minutes, and the mold of the heat retaining members 12a and 12b is completed. The tightening (closing) start time is about 30 to 60 seconds from the start of filling the molten metal W, and this is also arbitrarily set depending on the size of the cast product, the amount of the molten metal W, and the like.

  In this manner, when the filling operation of the molten metal W is completed and the molten metal W is cured, the heat retaining members 12a and 12b are opened by controlling the opening / closing drive device 11 and then the movable molds 5a and 5b are opened and closed. The cylinders 8a and 8b are operated to be opened, and the cast product is taken out from the mold, and the operation is completed.

  Further, the second embodiment of the present invention is limited to the detection means 13 such as a contact or non-contact type molten metal level gauge as a control means for starting the mold clamping (closing) of the heat retaining members 12a and 12b. First, for example, the tilt angle of the angle meter 16 provided in the molten metal filling device 15 for filling the molten metal into the cavity 9 is observed, or the time of bulk at the start of filling is measured by the timer T, and the control device 16 is used. It is also possible to configure the opening / closing drive device 11 to be closed.

  By doing in this way, it is not necessary to detect the level of the molten metal W one by one, the start of mold clamping (closing) of the heat retaining members 12a and 12b can be controlled from the outside of the mold, and workability can be improved. .

  As described above, in the present invention, the heat retaining member 12a, 12b including the pair of left and right slidable opening / closing drive devices 11 is disposed in the hot water space 10 between the pair of movable molds 5a, 5b, and the cavity By clamping the heat retaining members 12a and 12b when the amount of the molten metal W in the base 9 reaches a predetermined position, it is possible to reduce problems caused by debris dropping on the upper surface of the plaster mold 2 when the heat retaining members 12a and 12b are clamped. The lifetime of the heat retaining member can be improved.

It is a longitudinal cross-sectional view of the die apparatus for casting which implemented this invention. (A), (b) is a top view and AA arrow sectional drawing of the metal mold | die for casting before molten metal filling. (A), (b) is the top view and BB arrow sectional drawing of the metal mold | die for casting during molten metal filling. (A), (b) is a top view and CC arrow sectional drawing of the metal mold | die for casting during molten metal filling. (A), (b) is the top view and DD arrow sectional drawing of the metal mold | die for casting after molten metal filling.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base frame 2 Gypsum mold 3 Fixed mold 4A, 4B Mold opening / closing apparatus 5a, 5b Movable mold 6 Guide rail 7a, 7b Mold opening / closing plate 8a, 8b Opening / closing cylinder 9 Cavity 10 Feeding part space part 11 Opening / closing drive apparatus 12a, 12b Thermal insulation member 12x Contact surface 13 Detection means 14 Control device 15 Melting and filling device 16 Angle meter Q Product part W Molten metal

Claims (10)

On the base frame of the casting mold, a fixed mold for installing a plaster mold, and a pair of left and right movable molds that can be opened and closed via a mold opening and closing device are installed on the fixed mold, In a casting mold apparatus in which a feeder is provided on a cavity of a product section defined by the plaster mold and the movable mold,
A heat retaining member provided with a pair of left and right slidable opening / closing drive devices is disposed in the hot water space between the pair of movable molds, and the pair of left and right heat retaining members is used as an amount of molten metal in the cavity of the product portion. A casting mold apparatus, characterized in that it is provided with a control means that is driven to close when the amount exceeds a certain amount.   The mold apparatus for casting according to claim 1, wherein the pair of left and right heat retaining members are formed in a U-shaped plane cross section using ceramic fiber or graphite as a material.   3. The casting mold apparatus according to claim 1, wherein the control means detects the amount of molten metal in the cavity by the detection means and controls the opening / closing drive device of the heat retaining member. 4.   The casting mold apparatus according to claim 1 or 2, wherein the control means detects the amount of molten metal supplied into the cavity and controls the opening / closing drive device of the heat retaining member.   The casting mold apparatus according to claim 1 or 2, wherein the control means detects a hot water supply time of the molten metal into the cavity and controls an opening / closing drive device of the heat retaining member.   A heat retaining member having a pair of left and right opening and closing drive devices disposed in a feeder space between a pair of movable molds is opened, and the product portion is separated into a cavity of the product section defined by the plaster mold and the movable mold. When filling the molten metal, when the amount of the molten metal in the cavity reaches a predetermined position below the heat retaining member from the upper surface of the gypsum mold, the opening / closing driving device of the pair of left and right heat retaining members is driven and closed via the control means. A casting method characterized by the above.   When the amount of molten metal in the cavity reaches a predetermined position by a contact or non-contact type molten metal level gauge disposed in the cavity of the mold, the opening / closing drive device for the pair of left and right heat retaining members is driven via the control means. The casting method according to claim 6, wherein the casting method is closed.   The casting method according to claim 6, wherein an opening / closing driving device of the pair of left and right heat retaining members is driven and closed via a control unit while measuring a filling amount of a molten metal filling device that fills the mold cavity with molten metal. .   The casting method according to claim 8, wherein the filling amount measuring means of the molten metal filling device is an angle meter provided in the molten metal filling device.   The casting method according to claim 8, wherein the filling amount measuring means of the molten metal filler is a timer for setting a tilt time of the molten metal filler.

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